If there are no wireless internet signals around then how is my iphone accessing the internet?

Also, if my iPhone already has access to the internet without connecting to a wi-fi server then what difference does connecting it to a wireless server make?If there are no wireless internet signals around then how is my iphone accessing the internet?
It is not using the wi-fi it is using the cellphone masts to connect to a central server.If there are no wireless internet signals around then how is my iphone accessing the internet?
ummm, your on a 3g network... DUH!!!! wifi is much faster, thats the differenceIf there are no wireless internet signals around then how is my iphone accessing the internet?
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